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Amazon SCS-C03 Exam Syllabus Topics:

Section	Weight	Objectives
Logging and Monitoring	18%	- Audit logging 1. AWS Config configuration tracking 2. AWS CloudTrail logging and analysis - Monitoring and alerting 1. Amazon CloudWatch metrics and alarms 2. Centralized security monitoring strategies
Infrastructure Security	20%	- Compute security 1. EC2 instance hardening 2. Container security (ECS/EKS basics) - Network security 1. VPC design and segmentation 2. Security groups and NACLs
Management, Governance and Compliance	14%	- Compliance and auditing 1. Security best practices alignment (CIS, NIST) 2. AWS Artifact compliance reports - Governance frameworks 1. AWS Organizations and SCPs 2. Multi-account security strategy
Identity and Access Management	16%	- AWS IAM fundamentals 1. Least privilege access design 2. Users, groups, roles, and policies - Federation and access control 1. IAM Identity Center (SSO) 2. Federated identity with SAML/OIDC
Data Protection	18%	- Encryption and key management 1. AWS KMS key management 2. Encryption at rest and in transit - Data security services 1. Amazon S3 security controls 2. Secrets Manager and Parameter Store
Threat Detection and Incident Response	14%	- Detection mechanisms 1. AWS Security Hub findings aggregation 2. Amazon GuardDuty threat detection - Incident response procedures 1. Automate response using AWS services (Lambda, CloudWatch, EventBridge) 2. Identify and investigate security incidents in AWS environments

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Amazon AWS Certified Security - Specialty 認定 SCS-C03 試験問題 (Q138-Q143):

質問 # 138
A company's security team wants to receive email notification from AWS about any abuse reports regarding DoS attacks. A security engineer needs to implement a solution that will provide a near- real-time alert for any abuse reports that AWS sends for the account. The security engineer already has created an Amazon Simple Notification Service (Amazon SNS) topic and has subscribed the security team's email address to the topic. What should the security engineer do next to meet these requirements?

A. Use the AWS Support API and a scheduled Lambda function to detect abuse report cases.
B. Use AWS CloudTrail logs with metric filters to detect AWS_ABUSE_DOS_REPORT events.
C. Create an Amazon EventBridge rule that uses AWS Health and identifies a specific event for AWS_ABUSE_DOS_REPORT. Configure the rule action to publish a message to the SNS topic.
D. Use the AWS Trusted Advisor API and a scheduled Lambda function to detect AWS_ABUSE_DOS_REPORT notifications.

正解：C

解説：
AWS Health provides real-time visibility into events that affect AWS accounts, including abuse notifications such as AWS_ABUSE_DOS_REPORT. According to the AWS Certified Security - Specialty Study Guide, AWS Health events are natively integrated with Amazon EventBridge, enabling automated, near-real-time responses without polling or custom code.
By creating an EventBridge rule that listens for AWS Health events related to abuse reports and configuring the rule to publish messages to an SNS topic, the security engineer ensures immediate notification to the security team whenever AWS issues a DoS-related abuse report for the account.

質問 # 139
A company uses AWS Config rules to identify Amazon S3 buckets that are not compliant with the company's data protection policy. The S3 buckets are hosted in several AWS Regions and several AWS accounts. The accounts are in an organization in AWS Organizations. The company needs a solution to remediate the organization's existing noncompliant S3 buckets and any noncompliant S3 buckets that are created in the future.
Which solution will meet these requirements?

A. Deploy an AWS Config aggregator that scopes only the accounts and Regions that the company currently uses. Create an SCP that contains a Deny statement that prevents the creation of new noncompliant S3 buckets. Apply the SCP to all OUs in the organization.
B. Deploy an AWS Config aggregator that scopes only the accounts and Regions that the company currently uses. Create an AWS Lambda function that responds to AWS Config findings of noncompliant S3 buckets by deleting or reconfiguring the S3 buckets.
C. Deploy an AWS Config aggregator with organization-wide resource data aggregation. Create an AWS Lambda function that responds to AWS Config findings of noncompliant S3 buckets by deleting or reconfiguring the S3 buckets.
D. Deploy an AWS Config aggregator with organization-wide resource data aggregation. Create an SCP that contains a Deny statement that prevents the creation of new noncompliant S3 buckets.
Apply the SCP to all OUs in the organization.

正解：C

解説：
The requirement includesremediating existing noncompliant bucketsand also handlingfuture noncompliant bucketsacross multiple accounts and Regions. Anorganization-wide AWS Config aggregatorprovides centralized visibility into compliance status across all member accounts/Regions. To remediate, AWS Config can trigger automation (commonly via EventBridge/SNS) that invokes anAWS Lambda function(or SSM Automation) to take corrective action--such as enabling default encryption, blocking public access, or applying required bucket policies--whenever a bucket is evaluated as noncompliant. This addresses both existing findings (by running remediation on current noncompliant resources) and new ones (by automatically reacting when new buckets appear or configurations drift).

質問 # 140
A security engineer for a company needs to design an incident response plan that addresses compromised IAM user account credentials. The company uses an organization in AWS Organizations and AWS IAM Identity Center to manage user access. The company uses a delegated administrator account to implement AWS Security Hub. The delegated administrator account contains an organizational trail in AWS CloudTrail that logs all events to an Amazon S3 bucket. The company has also configured an organizational event data store that captures all events from the trail.
The incident response plan must provide steps that the security engineer can take to immediately disable any compromised IAM user when the security engineer receives a notification of a security incident. The plan must prevent the IAM user from being used in any AWS account. The plan must also collect all AWS actions that the compromised IAM user performed across all accounts in the previous 7 days.
Which solution will meet these requirements?

A. Disable the compromised IAM user in the organization management account. Use Amazon Athena to query the organizational CloudTrail logs in the S3 bucket for actions that the IAM user performed in the previous 7 days.
B. Remove any permission sets that are assigned to the IAM user in IAM Identity Center. Use Amazon CloudWatch Logs Insights to query the CloudTrail logs in the S3 bucket for actions that the IAM user performed in the previous 7 days.
C. Remove all IAM policies that are attached to the IAM user in the organization management account.
Use AWS Security Hub to query the CloudTrail logs for actions that the IAM user performed in the previous 7 days.
D. Disable the IAM user's access in IAM Identity Center. Use AWS CloudTrail to query the organizational event data store for actions that the IAM user performed in the previous 7 days.

正解：D

解説：
When AWS IAM Identity Center is used to manage user access across an AWS Organization, Identity Center is the authoritative control plane for enabling and disabling user access. According to the AWS Certified Security - Specialty Official Study Guide, disabling a user in IAM Identity Center immediately prevents that user from accessing any AWS account or role that is assigned through permission sets, satisfying the requirement to stop access organization-wide.
Disabling an IAM user in a single account or removing attached policies (Options A and B) does not prevent access through IAM Identity Center-managed roles in other accounts. Option C is incomplete because removing permission sets does not immediately disable authentication and still requires querying logs from an unsupported source.
For investigation and evidence collection, AWS CloudTrail organizational event data stores provide centralized, queryable access to all management and data events across all accounts in the organization.
CloudTrail Lake enables security engineers to run SQL-based queries directly against event data without exporting logs to other services. This allows rapid collection of all actions that the compromised user performed during the last 7 days.
AWS documentation explicitly identifies the combination of IAM Identity Center for access revocation and CloudTrail Lake for organization-wide investigation as a best practice for identity-related incident response.
AWS Certified Security - Specialty Official Study Guide
AWS IAM Identity Center Documentation
AWS CloudTrail Lake User Guide
AWS Incident Response Best Practices

質問 # 141
A company operates a web application that runs on Amazon EC2 instances. The application listens on port 80 and port 443. The company uses an Application Load Balancer (ALB) with AWS WAF to terminate SSL and to forward traffic to the application instances only on port 80.
The ALB is in public subnets that are associated with a network ACL named NACL1. The application instances are in dedicated private subnets that are associated with a network ACL named NACL2. An Amazon RDS for PostgreSQL DB instance that uses port 5432 is in a dedicated private subnet that is associated with a network ACL named NACL3. All the network ACLs currently allow all inbound and outbound traffic.
Which set of network ACL changes will increase the security of the application while ensuring functionality?

A. Make the following changes to NACL3:
- Add a rule that allows inbound traffic on port 5432 from NACL2.
- Add a rule that allows outbound traffic on ports 1024-65536 to NACL2.
- Remove the default rules that allow all inbound and outbound traffic.
B. Make the following changes to NACL2:
- Add a rule that allows inbound traffic on port 5432 from the CIDR blocks of the RDS subnets.
- Add a rule that allows outbound traffic on port 5432 to the RDS subnets.
C. Make the following changes to NACL2:
- Add a rule that allows outbound traffic on port 5432 to the CIDR blocks of the RDS subnets.
- Remove the default rules that allow all inbound and outbound traffic.
D. Make the following changes to NACL3:
- Add a rule that allows inbound traffic on port 5432 from the CIDR blocks of the application instance subnets.
- Add a rule that allows outbound traffic on ports 1024-65536 to the application instance subnets.
- Remove the default rules that allow all inbound and outbound traffic.

正解：D

解説：
Network ACLs are stateless subnet-level controls, so both request traffic and return traffic must be explicitly allowed. The PostgreSQL database subnet should allow inbound TCP 5432 only from the application subnet CIDR blocks, not from the internet or unrelated subnets. Because return traffic from the database uses ephemeral destination ports on the client side, the outbound rule from the database subnet must allow TCP 1024-65536 back to the application instance subnets. Option A is invalid because network ACL rules use CIDR blocks, not other NACL names as sources or destinations. Options C and D modify only the application subnet NACL and fail to correctly restrict and allow database subnet return traffic.

質問 # 142
CloudFormation stack deployments fail for some users due to permission inconsistencies. Which combination of steps will ensure consistent deployments MOST securely? (Select THREE.)

A. Allow iam:PassRole to the service role.
B. Attach scoped policies to the service role.
C. Create a service role with cloudformation.amazonaws.com as the principal.
D. Attach service ARNs in policy resources.
E. Create a composite principal service role.
F. Update each stack to use the service role.

正解：A、C、F

解説：
AWS best practices require CloudFormation to assume a dedicated service role. This ensures consistent permissions regardless of the user. Users must have iam:PassRole permission to pass the role. Updating stacks to use the service role enforces uniform deployment behavior.

質問 # 143
......

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